2results about How to "Strong engineering realization" patented technology

This invention discloses a method and system for local differential privacy aggregate value data aggregation based on sketches and sampling, belonging to the field of privacy computing and big data analysis technology. The method includes: initializing and disclosing sketch structure parameters on the server side; constructing aggregate value data on the user side, randomly selecting counter indices and determining the hash collision set; randomizing the hash collision set elements on the user side according to the aggregation function type, calculating the hit rate and performing adaptive pruning; reporting triples on the user side; and accumulating and updating the sketch counter on the server side, calculating the aggregated statistics through median estimation. This invention replaces traditional multi-element perturbation with sketch sampling and lightweight reporting, without requiring additional privacy budget consumption, effectively solving the noise accumulation problem, significantly reducing computational and communication overhead, and achieving a balance between privacy protection and statistical utility.

The application discloses a pseudo-virtual element method for a small-scale tightly-coupled electric scanning array, which comprises the following steps: S1, performing period boundary debugging and determining basic unit parameters; S2, establishing a complete array comprising effective units (1) and pseudo-virtual elements (2), and performing small signal feeding on the pseudo-virtual elements (2) to determine the size of the pseudo-virtual elements (2) and small signal power; S3, setting the input impedance of the pseudo-virtual elements (2) as Z1, setting the input impedance of the effective units (1) as Z2, simultaneously connecting the virtual elements without adjacent effective units (1) to a preset load as real virtual elements (3), simulating the complete array, and fine-tuning structure parameters and the size of a power divider (4) to complete the design. The application can significantly suppress the performance deterioration caused by the edge effect, improve low-frequency standing wave and radiation performance, maintain array phase consistency and scanning performance, and is suitable for super wideband small-scale tightly-coupled electric scanning arrays and has strong engineering implementation.